AD 2016-04-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Latent failures of the equipment cooling system and low pressure environmental control system, in combination with a cargo fire event, could result in smoke in the flight deck and/or main cabin, and possible loss of aircraft control.
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Required Actions
Conduct repetitive testing for correct operation of the equipment cooling system and low pressure environmental control system, and take corrective actions if necessary. For certain airplanes, install new relays and perform wiring changes to the environmental control system.
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Compliance Time
Within 9,000 flight hours from the effective date of the AD.
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Affected Aircraft
The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, regardless of whether they have been reconfigured using Boeing Special Attention Service Bulletin 737-26-1122, Revision 1, dated August 13, 2009.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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